Laser spectroscopy of atoms approaching a surface of ionic crystalline material: evidence of pure dephasing due to stochastic near fields

2007 ◽  
Author(s):  
V. V. Khromov ◽  
N. B. Leonov ◽  
S. G. Przhibel'skii ◽  
V. N. Smirnov ◽  
E. V. Vaschenko ◽  
...  
Author(s):  
K.L. More ◽  
R.A. Lowden ◽  
T.M. Besmann

Silicon nitride possesses an attractive combination of thermo-mechanical properties which makes it a strong candidate material for many structural ceramic applications. Unfortunately, many of the conventional processing techniques used to produce Si3N4, such as hot-pressing, sintering, and hot-isostatic pressing, utilize significant amounts of densification aids (Y2O3, Al2O3, MgO, etc.) which ultimately lowers the utilization temperature to well below that of pure Si3N4 and also decreases the oxidation resistance. Chemical vapor deposition (CVD) is an alternative processing method for producing pure Si3N4. However, deposits made at temperatures less than ~1200°C are usually amorphous and at slightly higher temperatures, the deposition of crystalline material requires extremely low deposition rates (~5 μm/h). Niihara and Hirai deposited crystalline α-Si3N4 at 1400°C at a deposition rate of ~730 μm/h. Hirai and Hayashi successfully lowered the CVD temperature for the growth of crystalline Si3N4 by adding TiCl4 vapor to the SiCl4, NH3, and H2 reactants. This resulted in the growth of α-Si3N4 with small amounts of TiN at temperatures as low as 1250°C.


1997 ◽  
Vol 92 (2) ◽  
pp. 301-306
Author(s):  
S. GIORGIANNI ◽  
P. STOPPA ◽  
A. DE LORENZI

1987 ◽  
Vol 48 (C7) ◽  
pp. C7-667-C7-669
Author(s):  
A. J. MERER ◽  
U. SASSENBERG ◽  
Y. AZUMA ◽  
J. O. SCHRÖDER ◽  
J. A. BARRY ◽  
...  
Keyword(s):  

Afghanistan ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 135-173
Author(s):  
Sara Peterson

Among the six excavated burials at Tillya-tepe, in northern Afghanistan, was one occupied by an elite woman wearing a substantial necklace consisting of large gold beads shaped as seed-heads. The scale and fine workmanship of this necklace suggest that it was one of her most important possessions. It can be demonstrated that these large seed-heads are representations of poppy capsules, whose significance lies in the fact that they are the source of the potent drug opium. This necklace is the most outstanding object within a group of items decorated with poppy imagery, all of which were discovered in female burials. The opium poppy has long been a culturally important plant, and the implication of this identification is investigated in several contexts. Firstly, the proliferation of poppy imagery in the female burials at Tillya-tepe is examined, and then there is a discussion of material evidence for opium among relevant peoples along the Eurasian steppes. The particular cultural importance of opium is reviewed, leading finally to a proposal for the societal role of these women.


2019 ◽  
Vol 37 (1) ◽  
pp. 89-110
Author(s):  
Rachel Fensham

The Viennese modern choreographer Gertrud Bodenwieser's black coat leads to an analysis of her choreography in four main phases – the early European career; the rise of Nazism; war's brutality; and postwar attempts at reconciliation. Utilising archival and embodied research, the article focuses on a selection of Bodenwieser costumes that survived her journey from Vienna, or were remade in Australia, and their role in the dramaturgy of works such as Swinging Bells (1926), The Masks of Lucifer (1936, 1944), Cain and Abel (1940) and The One and the Many (1946). In addition to dance history, costume studies provides a distinctive way to engage with the question of what remains of performance, and what survives of the historical conditions and experience of modern dance-drama. Throughout, Hannah Arendt's book The Human Condition (1958) provides a critical guide to the acts of reconstruction undertaken by Bodenwieser as an émigré choreographer in the practice of her craft, and its ‘materializing reification’ of creative thought. As a study in affective memory, information regarding Bodenwieser's personal life becomes interwoven with the author's response to the material evidence of costumes, oral histories and documents located in various Australian archives. By resurrecting the ‘dead letters’ of this choreography, the article therefore considers how dance costumes offer the trace of an artistic resistance to totalitarianism.


Sign in / Sign up

Export Citation Format

Share Document